[Bug target/52572] suboptimal assignment to avx element

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52572

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-13 07:54:14 UTC ---
Have you actually tried that?  Mixing VEX encoded insns with legacy encoded
SSE* insns is very costly, for good performance there needs to be a vzeroupper
in between (but then you lose the upper bits).  See e.g. 2.8 in the AVX
Programming Reference.